↑Günther, Albert (1882) Observations on some rare Reptiles and a Batrachian now or lately living in the Society's Menagerie, Transactions of the Zoological Society of London 11 (7): 215-222, 5 plates (2 in color)

↑Gray, J.E. (1844) Catalogue of Tortoises, Crocodilians, and Amphisbaenians in the Collection of the British Museum., British Museum (Natural History), London. viii + 80 p.